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    <title>HTML5 Sandbox: Nested iframes cannot have less sandbox restrictions than their most restrictive ancestor iframe.</title>
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    <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
    <link rel="help" href="http://dev.w3.org/html5/spec/Overview.html#attr-iframe-sandbox" />
    <meta name="assert" content="Nested iframes cannot have less sandbox restrictions than their most restrictive ancestor iframe." />
    <script src="sandbox_helper.js" type="text/javascript"></script>
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    <pre>Description: Nested iframes cannot have less sandbox restrictions than their most restrictive ancestor iframe.</pre>
    <div>This test is to verify script is blocked inside nested iframes if the top-most sandbox iframe has no 'allow-scripts' token.</div>
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    <table id='testtable' border='1'>
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            <td>Test Result</td>
            <td>Test Assertion</td>
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            <td id='test_0_result'>Manual</td>
            <td id='test_0_assertion'>Test passes if there is no red on the page.</td>
        </tr>
    </table>
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    <div id="testframe">
        <div style="font-weight:bold">Top-most iframe with sandbox=""</div>
        <iframe id="iframe1" name="iframe1" src="iframe_sandbox_020.htm" sandbox="" style="height: 330px; width: 400px;"></iframe>
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    <script type="text/javascript">
        DisableTestForNonSupportingBrowsers();
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